Writing & Language
While working together at the Jane GoodallInstitute's Tchimpounga Chimpanzee Sanctuaryin the Republic of Congo, cognition researchersFelix Warneken and Alexandra Rosati conducted anexperiment comparing chimpanzees' decisions in twosituations: a "raw-delay" condition and a "cooked-delay" condition. In the raw-delay condition, Warneken and Rosati offered the chimpanzees achoice between receiving a piece of raw food immediately and waiting for one minute to receivethree pieces of raw food; the chimpanzees chose the larger, delayed reward 60 percent of thetime. In the cooked-delay condition, in which the chimpanzees could receive one piece of rawfood immediately or wait one minute for three pieces of cooked food, they chose the larger, delayed reward approximately 85 percent of the time.
Which choice most effectively introduces the main topic of the paragraph?
解析：